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42=15x+27
We move all terms to the left:
42-(15x+27)=0
We get rid of parentheses
-15x-27+42=0
We add all the numbers together, and all the variables
-15x+15=0
We move all terms containing x to the left, all other terms to the right
-15x=-15
x=-15/-15
x=1
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